Artificial reefs do increase secondary biomass production: mechanisms evidenced by stable isotopes
Résumé
A large complex of artificial reefs was deployed in the Bay of Marseilles, North-Western Mediterranean, for
the enhancement of commercial fisheries stocks. Carbon and nitrogen stable isotope and stomach content
analyses were performed on 23 fish species collected on the artificial reefs to assess their trophic position and
feeding behaviour. Results indicated that fish diets were not modified on the artificial reefs compared to natural
environments, nor was the structure of their trophic network. Artificial reefs, with their complex design, provide
diverse and abundant food sources for fishes. Ranges of δ13C and δ15N of artificial reef fishes were comparable to
those recorded in natural Mediterranean environments, with a similar trophic organization. However, some
discrepancies appeared when comparing fish trophic level based on isotopic or diet results, which calls for a
careful interpretation of stable isotope values as direct indicators of trophic level.
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